Pour water into bowl and sprinkle yeast over it. Sprinkle sugar and salt over yeast and wait until yeast bubbles and comes to the surface. Stir in oil. Add 4 cups of flour all at once. Mix with a wooden spoon until dough gathers together in a ball. Scrape down sides of bowl incorporating dough particles. If dough is sticky, add additional flour until it can be handled easily. Turn dough out into floured board and divide into two loaves. Shape each loaf and place into greased bread pans and cover with a wet dish towel. When bread has doubled in bulk, bake 375 degrees in preheated oven for 30-35 minutes until brown. Turn on to a rack to cool.